Light is a form of energy, which is propagated as electromagnetic wave.
It is the radiation which make our eyes able to ‘see the object. Its speed is 3 x 108 m/s. It is the form of energy. It is a transverse wave.
It takes 8 min 19s to reach on the earth from the sun and the light reflected from moon takes 1.28s to reach earth.
Primary Colours- Blue, Red, Green
Secondary Colours- The coloured produced my mixing any two primary colors
Complementary Colours- Any two colours when added produce white light.
Blue colour of sky is due to scattering of light.
The brilliant red colour of rising and setting sun is due to scattering of light. Human Eye
Least distance of distinct vision is 25 cm.
Myopia or short sightedness- far objects cannot see clear
Hyperopia or hypermetropia or Long-sightedness- Near objects cannot see clear
Presbyopia- in elder person, both far and near cannot see clear Reflection of Light
When a ray of light falls on a boundary separating two media comes back into the same media, then this phenomenon is called reflection of light. Reflection from Plane Mirror
If an object moves towards a plane mirror with speed v, relative to the object the moves towards it with a speed 2v.
To see his full image in a plane mirror, a person required a mirror of at least half of his height
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